[RFC] space saving optimizations.

[David Miller]

From: Ondřej Bílka <neleai@seznam.cz>
Date: Tue, 12 Feb 2013 09:11:23 +0100

> There is problem how treat ifuncs. There are three possibilities,
> First is parametrize function by target ifunc choosed.
> Second is use indirect jump with similar selector as ifunc.
> Third is jump to fixed implementation.

On Sparc I simply have a unique mempcpy stub for each memcpy ifunc
case.